conf: Trivial cleanup of 'cells'
conf: Trivial cleanup of 'cells'

* Fix indentation
* Add TODOs for items that still need attention
* Place items that are deprecated to the top to ease grouping in the
  future

Change-Id: I5283f8eb7c4906f974a76af0a154711b3b1aeac5
blueprint centralize-config-options-ocata

Juniper/nova,phenoxim/nova,vmturbo/nova,rahulunair/nova,Juniper/nova,klmitch/nova,hanlind/nova,sebrandon1/nova,sebrandon1/nova,gooddata/openstack-nova,openstack/nova,mikalstill/nova,mikalstill/nova,jianghuaw/nova,cloudbase/nova,rahulunair/nova,rajalokan/nova,hanlind/nova,vmturbo/nova,Juniper/nova,mikalstill/nova,openstack/nova,vmturbo/nova,gooddata/openstack-nova,cloudbase/nova,mahak/nova,klmitch/nova,rajalokan/nova,phenoxim/nova,mahak/nova,klmitch/nova,rahulunair/nova,Juniper/nova,cloudbase/nova,vmturbo/nova,jianghuaw/nova,jianghuaw/nova,jianghuaw/nova,gooddata/openstack-nova,hanlind/nova,sebrandon1/nova,mahak/nova,gooddata/openstack-nova,openstack/nova,rajalokan/nova,klmitch/nova,rajalokan/nova